A 1-phosphatidyl-1D-myo-inositol 4,5-bisphosphate(5−) obtained by deprotonation of the phosphate OH groups of 1-stearoyl-2-arachidonoyl-sn-glycero-3-phospho-1D-myo-inositol 4,5-bisphosphate; major species at pH 7.3.